It is known that the solution u
of the heat equation ∂u∕∂t = Δu under the boundary condition u = 0 decays as
e−λtu for some λ > 0 as t →∞. This gives us information about the asymptotic
behavior of the solution u in time.
There arises the question whether such a theorem is valid for parabolic differential
equations with variable coefficients.
In this note we shall treat this problem and prove that the theorem analogous to
the above holds for parabolic differential inequalities of higher order under some
additional restrictions.
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